<template>
<slot></slot>
  <div class="xtx-infinite-loading" ref="target">
    <div class="loading" v-show="modelValue">
    <!-- <div class="loading" v-show="loading"> -->
      <span class="img"></span>
      <span class="text">正在加载...</span>
      <!-- <span class="text"><slot>正在加载...</slot></span> -->
    </div>
    <div class="none" v-if="finished">
      <span class="img"></span>
      <!-- <span class="text">亲，没有更多了</span> -->
      <span class="text">{{finishedText}}</span>
    </div>
  </div>

</template>

<script>
import { ref } from 'vue'
import { useIntersectionObserver } from '@vueuse/core'
export default {
  name: 'XtxInfiniteLoading',
  props: {
    // loading: {
    //   type: Boolean,
    //   default: false
    // },
    finished: {
      type: Boolean,
      default: false
    },
    finishedText: {
      type: String,
      default: '亲，没有更多了'
    },
    modelValue: {
      type: Boolean,
      default: false
    }
  },
  emits: ['load'],
  setup (props, { emit }) {
    const target = ref(null)
    useIntersectionObserver(
      target,
      ([{ isIntersecting }]) => {
        if (isIntersecting) {
          // 进入可视区，切loading为false跟finished才发送请求
          // if (props.loading === false && props.finished === false) {
          if (props.modelValue === false && props.finished === false) {
            emit('load')
          }
        }
      }
    )
    return { target }
  }
}
</script>

<style scoped lang='less'>
.xtx-infinite-loading {
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 50px;
      height: 50px;
      background: url(~@/assets/images/load.gif) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
  .none {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 200px;
      height: 134px;
      background: url(~@/assets/images/none.png) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
}
</style>
